<template>
  <div>
    <el-form :rules="rules"
             v-loading="loading"
             element-loading-text="正在登陆"
             element-loading-spinner="el-icon-loading"
             element-loading-background="rgba(0, 0, 0, 0.8)"
             ref="loginForm"
             :model="loginForm"
             class="loginContainer">
      <h3 class="loginTitle">系统登录</h3>
      <el-form-item prop="username">
        <el-input type="text" auto-complete="false" v-model="loginForm.username" placeholder="请输入用户名"/>
      </el-form-item>
      <el-form-item prop="password">
        <el-input type="password" auto-complete="false" v-model="loginForm.password" placeholder="请输入密码"/>
      </el-form-item>
      <el-form-item prop="code">
        <el-input type="text" auto-complete="false" v-model="loginForm.captcha" placeholder="点击图片更换验证码" style="width: 250px; margin-right: 5px;"/>
        <img :src="captchaUrl" @click="updateCaptcha">
      </el-form-item>
      <el-form-item>
        <el-button type="primary" style="width: 100%" @click="submitLogin">登录</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
  name: "Login",
  data(){
    return {
      captchaUrl:'/captcha?time='+new Date(),
      loginForm:{
        username:'',
        password:'',
        captcha:''
      },
      rules:{
        username: [{required:true, message:'请输入用户名', trigger:'blur'}],
        password: [{required:true, message:'请输入密码', trigger:'blur'}],
        captcha: [{required:true, message:'请输入验证码', trigger:'blur'}]
      },
      loading:false
    }
  },
  methods:{
    submitLogin(){
      this.$refs.loginForm.validate((valid) => {
        if (valid) {
          // 开始正在加载动画
          this.loading = true;
          this.postRequest('/login', this.loginForm).then(resp=>{
            // 判断一下是否为空，如果成功访问为空的话就是有错误被响应拦截器拦截掉了，这边收到的resp是空
            if (resp){
              // 拿到token
              const tokenStr = resp.obj.tokenHead+resp.obj.token;
              // 将token存到sessionStorage中
              window.sessionStorage.setItem("tokenStr", tokenStr);
              // 获取重定向链接
              let path = this.$route.query.redirect;
              // 正在加载取消
              this.loading = false;
              // 跳转
              this.$router.replace((path == undefined?'/home':path));
            }
            this.loading = false;
          })
        } else {
          this.$message.error('请输入所有字段');
          return false;
        }
      });
    },
    updateCaptcha(){
      this.captchaUrl = '/captcha?time' + new Date();
    }
  }
}
</script>

<style scoped>

.loginContainer {
  border-radius: 15px;
  background-clip: padding-box;
  margin: 180px auto;
  width: 350px;
  padding: 15px 35px 15px 35px;
  background: #fff;
  border: 1px solid #eaeaea;
  box-shadow: 0 0 25px #cac6c6;
}

.loginTitle {
  margin: 10px auto 25px auto;
  text-align: center;
}

</style>